480 Philippine Journal of Science 1920 
was within twenty-four hours. The tube with its contents was 
weighed, the plant material was removed (and preserved for 
the dry-weight determination), and the tube was finally weighed 
dry. From the data thus obtained the green weight and the 
water content of the tops were determined, the latter being fi- 
nally expressed as percentage on the basis of green weights. 
RESULTS 
AERIAL CONDITIONS OF THE EXPERIMENT SERIES 
Before proceeding to the presentation of the results obtained 
from the plants it will be well to present, once for all, the data 
that characterize the aérial conditions for the various experiment 
TABLE 4.—Maximum and minimum temperatures and average daily at- 
mometric and radio-atmometric indices for the different experiment 
periods. 
- ? Average daily ra- 
Experiment period (1918). Air tempe- |Average_ a = dio-atmometric 
: rature. | mometric index. index.® 
Series 
No. Days. | 
3, P . +] oy Ss nts A -| Mi <) Mini- Aver- 
Beginning. Ending. cnet he race avons po ore mum,| age. 
oC | °C | eo. | ce: | ce. | ec. 4 C6. ce. 
4| February 22 | March 14} 20/388 | 9 | 26.9] 12.0} 20.2 |.--...]------|------- 
10 
11 Mar, i 
2 ch 11 | April 5) 25) 82.2] 8.5} 38.9] 11.1 | 23.0 |------|------]------- 
13 
1 
2 
5 | (March 21 | April 11} 214} s2.2| 8.0 | 27.2| 11.1} 22.8 |------|-----] ----" 
7 
9 
3 
nS iemeshag 24 | April 11! 18] 32.21 8.0| 26,8 | 11.1 | 222 |------|------}------" 
8 
* 
18 |;May 24 | June Vet SE OTL hs eseiees Reta BP a 
21 
14 * 
16 r 
19 [June 19 | July 91 20| 38.0) 14.0) 27.6] 63|181| 27) -7| 
20 
~ 9 
25 |;August 3| August 23] 20| 99.0 | 15.0 30.4| 14.3 | 18.2) 9.2] -68| » 
ai 
on 1.2 
26 |!September 9| September 29| 20| 30.0| 9.0| 19.7| 6.2 12.0} 21) -54 
23 
jag OOO 
ye ; erical 
* The atmometric index is the daily rate of water loss from standard white 2 
porous-cup atmometer. The radio-atmometrie index is the daily excess of wee 
standard black spherical atmometer, above that from the white. 
